Stone buffer



March l1, 1930.

A, VAN DE' sND'r 1,749,860

STONE BUFFER vFiled Feb. 27, 1926 2 Sheets-Sheet 1 agay. 1.

March 1l, 1930. A VAN DEASANDT 1,749,860

STONE BUFFER Filed Feb. 27, 1926' 2 Sheets-Sheet 2 gwumkoz .Yan of? Sandi' aucuns;

Patented Mar. 11, 1930 PATENT OFFICE ALFRED VAN DE SANDT, yOF LOS ANGELES, CALIFORNIA s'roNn BUFFER Application filed February 27, 1926. Serial No. 91,123.

lVith the present generally known method of applying finish to stone; namely, that in which the disc is used and disposed face downward, a perfectly flat surface is neces` sary to obtain satisfactory results. The present method is, therefore, defective for general application except in rare cases. Since the texture of the stone varies in spots and the polishing disc employed is inflexible, low spots or slight depressions cannot effectively be reachedrand what polish is secured by the method is produced by burnishing, later causing corrosion, particularly in white marble. It is a purpose of the present invention,

therefore, to provide a construction in which the rubbing surface of the polishing element may change in accordancewit-h and to conform to irregularities of contour in the stoneA being operated upon; to provide a. construction in which the even pressure necessary to effect the best results is had, so that slight depressions or hollow sections may be reached; and to provide a construction consisting of rotary polishing elements susceptible, when in use, of changes in configuration both peripherally and axially.

With this purpose in view, the invention consists in a construction and combination of parts of which a preferred embodiment is illustrated in the accompanying drawings, wherein:

Figure 1 is a side elevational view of the invention.

Figure 2 is a top plan view.

Figures 3, 4 and 5 are respectively sectional views on the planes indicated by the lines 3 3, 4 4 and 5-5 of Figure 2.

In the illustrated embodiment of the invention, the buifing or polishing elements consist of the cylindrical rolls 10 carried by a frame 11 simulating the general form of a pair of scissors. The sections of the frame are pivotally connected by means of a rock shaft 12 and the rolls have a bodily movement in an arc with the rock shaft as a center, being impelled toward each other by means of the springs 14 coiled around the protruding extremities of the rock shaft and terminally secured to the elements of the frame, the connections between the springs and the frame consisting of posts 15 on the sections or elements of the latter, said posts being provided with transverse eyes in which the extremities of the springs have sliding engagement. Collars 16 are secured to the rock shaft and serve to retain the coiled portions of the spring in position thereon and serve also to retain the rock shaft in the frame.

The'polishing or bufiing rolls are susceptible of flexion both peripherally and axially due to their construction specifically defined later on. Because of this feature, all portions of the stone surface being polished are readily reached with the peripheral faces of the rolls and the springs 14 function to maintain even pressure when the handles 17 are grasped by the operator, the illustrated form of the invention being designed for hand operation. Each element of the frame carries one of the handles yand downward pressure upon them, when the rolls are in contact with the stone, tends to move the rolls away from each other, but at the same time pressure is being applied yupon the stone and because of the character of the rolls, all irregularities in surface contour are reached by the polishing surface.

The elements or sections of the frame each consists of the opposed side bars 18 to which the handle bars 19 are secured, the bars 18 and 19 being disposed at an acute angle. The bars 19 are longer than the bars 18 and thus the handle 17 associated with each roll is disposed' in a vertical plane outside of the verator, due to the increased leverage afforded by the position of the handles, is less than the pressure exerted by the rolls upon the surface being polished. The rolls are journalled in the extremities of the bars 18 and motion is communicated to them in any acceptable manner. In the present embodiment, a iiexible shaft 20 connects the two rolls on one side of the frames and one of the rolls on the opposite side isprovided with a protruding` stub shaft 21 with which a driving means may be connected. This also may be of any acceptable form but would preferably be a flexible shaft connected with a driving motor, neither of which is illustrated here as the end discs 24 formed withfstub shafts 25,1 the.

latter constituting theournalsin the bars 18 of the frame sections and certain ones being extended for connection with the flexible shaft 2O while the extension of another constitutes the stub shaft 2l. The connections Vbetween the discs and the springs consist of annular fianges 26 and 27 formed on the inner faces ofthe discs and defining cylindrical seats for the extremities of the springs which are'secured to the discs in these seats in any acceptable manner. In surrounding relation to the shafts consisting of the springs 22 and 23 there is disposed an'interior cushion 28 of readily yieldingmaterial,

' such as rubber, and bounding this cushion there is a more Yflexiblecushion 29 made holor-air under pressure, this latter cushion carrying thebufhng or peripheral polishingelement 30 which may, ifdesirable, be provided with bristles or which, as shown, may be a Y suitable fabric chemically treated.

Vt-ure.- low for thereception of a fluid, such as water tween the endsiof the roll being flexible, a

cushion of yielding material surroundingY and enclosing the i flexible portion of the shaft, and a iiuidcushion interposed between the first said cushion andthe buiing surface. 6. A stone buiiing roll provided with a pe,-V

ripheral buiiing surface, a shaft extending Y through the roll and supportingthe latter and consisting of telescopicallyrelatedspiral springs terminating at the ends of the roll, a cushion of yielding material surrounding and enclosing said shaft, anda fluid cushion interposed between the first'saidcushion and the buifing surface. Y

7. A stone buiiing roll provided with a pei ripheral buifing surface, end disks of less diameter than lthe roll at the bufhng surface,A c

said end disks being provided with ystub shafts constituting journals, a flexible shaft within the roll and Vconsisting'of reversely wound telescopically related spiral springsV`V connected with the end disks, a cushion ;of yieldingmaterial enclosing said shaft and a iiuid vcushion interposed between the'` first said cushion and the buiiing surface.v

in testimony whereofY her aiiixes his signa- YAmann VAN DsANDT. o

It is obvious that, with the polishing rolls i l.

constructed along the plan indicated, they become conformable to irregular contours in the direction of their length as well asperipherally and consequently the rolls become effective for applying the desired polish to all the surface of the stone being operated upon, the bottoms of grooves, high points, yridges .E lace. Y Y Y The invention having been described, what is claimed as new and useful 1s:

l. A stone polishing rolly bodily bendable axially between its extremities. p

2; A stone polishing roll having a distortable bufling face and being bodily V.benda-ble axially between its'extremities. y

3. A stone polishing roll having a peripheral or bufing surface, a fluid cushion immediately behind said surface, and a shaft extending through and supporting said roll at separated points within the `roll andv being n flexible between the points.

4. A stone'buifing roll provided with a-peripheral bufiing surface, and a shaft extending through said roll and supporting the latter, the roll and that portion of the within the roll being flexible.

shaft and depressions as effectivelyas the even sur- Y i 5. A stonebuiiing roll provided with a peripheral 'buffing surface, a shaft extending through the roll andgrsupporting the latter, that portionV of theshaft comprehended be- 

